The practical application of polypropylene fiber reinforced concrete in China railway tunnel lining structure within hard and weak rockmass

The use of fiber reinforced concrete with wet sprayed concrete technique can improve the concrete lining structure construction quality and improve the rock mass self-bearing capacity. In the paper, the introduction of the wet-sprayed fiber reinforced concrete is proposed to be the ideal tunnel lining structure in both the hard rockmass and the soft and weak rockmass, namely Dongjusigou railway tunnel and Jinhuashan railway tunnel early stage lining structure. The monitoring data result shows that the rock mass pressure in experimental section is even distribution with lower rock mass pressure and lower concrete lining layer stress. The value of rock mass pressure and tunnel lining layer stress in comparison tunnel section is a little higher than that in experimental tunnel section. The experimental tunnel section using fiber reinforced concrete has good lining effect.